本人小白,刚开始学。。。
$query="insert into movie (rating) values ('$num3')";
$result=mysql_query($query);
单独的打印出$num3得到的结果是9.2,但这样存到数据库里为什么就变成0了?字段rating是float类型的
还有$query="insert into movie (title) values ('$m[0][$i+5]')"; 单独的打印出$m[0][$i+5]是asdfg
但存入数据库就变成 Array[1+5] 这个了。 字段title是char类型的
是我的语句有问题吗
回复讨论(解决方案)
$query="insert into movie (rating) values ('".$num3."')";$query="insert into movie (title) values ('".$m[0][$i+5]."')";
PHP code?12$query="insert into movie (rating) values ('".$num3."')";$query="insert into movie (title) values ('".$m[0][$i+5]."')";
还是不行啊。。。
$query="insert into movie (rating) values ('$num3')";
这个不会有问题,可写作
$query="insert into movie (rating) values ($num3)";
看看
$query="insert into movie (title) values ('$m[0][$i+5]')";
应写作
$query="insert into movie (title) values ('{$m[0][$i+5]}')";
$query="insert into movie (rating) values ('$num3')";
这个不会有问题,可写作
$query="insert into movie (rating) values ($num3)";
看看
$query="insert into movie (title) values ('$m[0][$i+5]')";
……
恩恩 多谢啦 第二个是写错了
不过才发现我犯了个更重大的错误 我的那几个变量都是通过正则表达式抓取到的页面内容,打印出来是那几个字符,但真实内容还包含的有标签,所以第一个无论如何也存不进去。。。。
$query="insert into movie (rating) values ('$num3')";
这个不会有问题,可写作
$query="insert into movie (rating) values ($num3)";
看看
$query="insert into movie (title) values ('$m[0][$i+5]')";
……
不过 如何从一串字符串
9.2
单独的提取出中间的9.2 并把它转化成float类型a
$s =<<< TXT<font face="Arial, Helvetica, sans-serif" size="-1">9.2</font>TXT;preg_match_all('/>([.\d]+)</', $s, $r);print_r($r[1]);Array
(
[0] => 9.2
)
PHP code?12345$s =9.2TXT;preg_match_all('/>([.\d]+)', $s, $r);print_r($r[1]);Array
(
[0] => 9.2
)
啊啊 谢谢谢谢,再弱弱的问一句 我要是提取这个呢
Redemption (1994)
提取Redemption 怎么用正则表达式才能不包括两边的标签啊
$s =<<< TXT<font face="Arial, Helvetica, sans-serif" size="-1"><a href="/title/tt0111161/">Redemption</a> (1994)</font>TXT;preg_match_all('#(?<=a)[^>]+>([^<]+)</a#', $s, $r);print_r($r[1]);Array
(
[0] => Redemption
)
不知道怎么感谢了。。。看来我还是得好好学学,好人一生平安。。。

What’s still popular is the ease of use, flexibility and a strong ecosystem. 1) Ease of use and simple syntax make it the first choice for beginners. 2) Closely integrated with web development, excellent interaction with HTTP requests and database. 3) The huge ecosystem provides a wealth of tools and libraries. 4) Active community and open source nature adapts them to new needs and technology trends.

PHP and Python are both high-level programming languages that are widely used in web development, data processing and automation tasks. 1.PHP is often used to build dynamic websites and content management systems, while Python is often used to build web frameworks and data science. 2.PHP uses echo to output content, Python uses print. 3. Both support object-oriented programming, but the syntax and keywords are different. 4. PHP supports weak type conversion, while Python is more stringent. 5. PHP performance optimization includes using OPcache and asynchronous programming, while Python uses cProfile and asynchronous programming.

PHP is mainly procedural programming, but also supports object-oriented programming (OOP); Python supports a variety of paradigms, including OOP, functional and procedural programming. PHP is suitable for web development, and Python is suitable for a variety of applications such as data analysis and machine learning.

PHP originated in 1994 and was developed by RasmusLerdorf. It was originally used to track website visitors and gradually evolved into a server-side scripting language and was widely used in web development. Python was developed by Guidovan Rossum in the late 1980s and was first released in 1991. It emphasizes code readability and simplicity, and is suitable for scientific computing, data analysis and other fields.

PHP is suitable for web development and rapid prototyping, and Python is suitable for data science and machine learning. 1.PHP is used for dynamic web development, with simple syntax and suitable for rapid development. 2. Python has concise syntax, is suitable for multiple fields, and has a strong library ecosystem.

PHP remains important in the modernization process because it supports a large number of websites and applications and adapts to development needs through frameworks. 1.PHP7 improves performance and introduces new features. 2. Modern frameworks such as Laravel, Symfony and CodeIgniter simplify development and improve code quality. 3. Performance optimization and best practices further improve application efficiency.

PHPhassignificantlyimpactedwebdevelopmentandextendsbeyondit.1)ItpowersmajorplatformslikeWordPressandexcelsindatabaseinteractions.2)PHP'sadaptabilityallowsittoscaleforlargeapplicationsusingframeworkslikeLaravel.3)Beyondweb,PHPisusedincommand-linescrip

PHP type prompts to improve code quality and readability. 1) Scalar type tips: Since PHP7.0, basic data types are allowed to be specified in function parameters, such as int, float, etc. 2) Return type prompt: Ensure the consistency of the function return value type. 3) Union type prompt: Since PHP8.0, multiple types are allowed to be specified in function parameters or return values. 4) Nullable type prompt: Allows to include null values and handle functions that may return null values.


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